Projecting instrument.



F. W. LANE.

PROJECTING INSTRUMENT. APPLICATION FILED JULY 8 1 914.

Patented June 8, 1915.

2 SHEETS-SHEET l.

I INVE/VTUR B'ederwk Walla/Zane ATTORNEYS) WITNESSES /%07QZ THE NORRIS PETERS CO" FH;'-LITHO WASHINGIDN. D C.

F. W. LANE.

PROJECTING INSTRUMENT.

APPLICATION nuzo JULY 8,1914.

1 ,152,585. Patented June 8, 1915.

2 SHEETS-SHEET 2.

WITNESSES v Ill/ liE/VTOI? E39derzc/1: W'aZi'er Lane w W ATTORNEYS THE NORRIS PEFERS 50.. PHOTO-LITHO-. WASHINGTON, D. C.

FREDERICK WALTER LANE, OFzCHIGO, CALIFORNIA.

PROJEGTING INSTRUMENT.

Specification of Letters Patent. 7 a v P t t d n 1915;

. Application filed. m 8,1914. Serial No. 849,699.

To all whom it may concern: I

Be it known that I, FREDERICK WALTER LANE, a citizen of the United States, anda resident of Chico, in the county of Butte and State of California, have invented a new and Improved Projecting Instrument, of which the following is a full, clear, and exact description. A The invention relates to' drafting and its object is to provide a new and improved projecting instrument more especially designed for drafting from any good'pattern the true contour of the cutting edge of a knife or a cuttelysuch as is used in the revolving cutter head of a planer, matcher, shaper, sticker or other similar woodworking machine. v

In order to accomplish the desired result use is'made of two pencil holders mounted to slide on the blade ofa guided T-square, a guide on the blade and a connection between the said guide and the said holder to move the same in a given ratio one'relative to the other. i g I A practical embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure l is a plan view of the projecting instrument; Fig. 2 is a side elevation of the same; Fig. 3 is a cross section of the same on the line 3-3- of Fig. 1; Fig. 4 is an enlarged cross section of the same on the line 4-4 of Fig. 1; Fig. 5 is a sectionalong theline 55 of Fig. 1, and Fig. 6 is a plan view of the bell crank lever used in conjunction with the guide for moving the pencil'holders one relative to the other. 7

It is well known that the cutting edge of a knife or a cutter ground to a certain pattern does not produce this pattern in the article tov be out, such as a molding when the knife is used in the usual revolving cutter head of portion. In order to produce the true contour. of the cutting edge of the knife or cutter when the contour o'fthe molding to be produced given is the object of the instrument presently described in detail;

On a drawing board or drawing table A is secured atrack B by the use of pins B or other fastening devices, and on the said track B is mounted to travel the head C of a T-square C havinga blade G extending over the drawing board A. The outer end is adapted to be moved along the contour Gr tools F and F, of which the marking tool F.

of a pattern for a -m0lding or the like marked on a sheet of paperG attached to Y The holder D is'pivotally connected by a link H with one arm ofa bell crank lever I fulcrumed at I on the'under side of" the other holder E, and the other arm of this bell crank lever I is provided with a pin or roller 1 engaging a curved slot J formed in the arm J 2 of a; guide J adj ustably secured on the bladeC, ofthe'T-square by cla'mping screws J 3 or the like. On the top of the guide J is arranged a scale K'on which indicates a pointer L arranged on the holder E, the said scale representing'the size of the smallest cutting circle made by the knife or cutter, Presuming, for instance, that the smallest circle cut by the knife or cutter is "say three inches then the user loosens the clamping screws J and moves the guide J lengthwise on the blade C until th'epointer; "L indicates on the markfB of the scale K,

after which 'the guide J isclamped in place by the clamping screws J The sheet G containing the contourG of the moldingto be produced by the cutter head is fastened to the table A and a blank sheet G is fastened to the table at a point below the holder E.

The sheet Gis'so located that the marking tool Fis at the smallest circle to be cut,

which is indicated at the contour G (see Fig. 1). The operator now manipulates the T-square C in such a manner that the marking tool F overlies the contour G and in doing so causes the other marking tool F to mark the true contour G of the cutting edge of the knife or cutter onto the sheet G it being understood that any sliding move ment given to the holder D on the blade G causes the-holder E to slide on the bladebut at a ratio corresponding to the movement of the pin 1 in the slot J of the guide arms J Thus'the contour G? produced by the mark ing tool E. is the one to which the cutters or knives are shaped to produce 'amolding having thecontour G shownin Fig. l.

The pattern curve G has been shown in Fig. 1 in juxtaposition to the cutter'curve G to show the direction between the said curves. In practice, the curve G'does not appear on the sheet G3. V

The detail construction of the T-square C is preferably as follows The head G1 is provided with a'grooved wheel C? mounted to travel on the track B, which latter is formed of a cylindrical rod fastened to the board A by the pins Bf as previously mentioned. The blade C of the T-square is provided at the under side with a groove C extending lengthwise of the blade to form a guide for the holders D fand E. The holder D (see Figs.*1,- 3 and 5) consists essentially of a head made in top and bottom sections D and D fastened together adjacent one edge of the blade C the section D" overlying the bladeC and the section D fitting the under side of the saidblade and havinga rib D slidably engagingthe groove C (see Fig. 5)

to holdthe :holder head slidable on the blade 0 The top section D is provided with centers D on which is mounted to swing up and'down an arm D extending at a right angle to the blade C and being provided, at'its free end with a suitable clamping or fastening device D for removably and ad justably'holding the marking tool F in place. The pivotal end of the arm D is provided with a heel D 'between which and the blade C is interposed a spring D to hold the point of the marking "tool F in contact with the sheet G. V

The holder E is constructed similar to the holder D and is formed of top and bottom sectionsE and E? fastenedtogether adjacent one edge of the blade C and the said bottom section E is provided with a rib E (see Fig. 5) engaging the groove G The bottom section E? is further provided with an extension arm E on whichthe bell crank lever I isfulcrum'ed. The top section E is provided with centers E on Which is mounted to swing up and down an arm E provided at its outer end with a clamping or fastening device E for adjustably and removably holding the marking tool F. The heel end of the arm E is pressed on by a spring E to hold the point of the marking tool F in contact with the sheet G The guide J is provided with a top part J 4 extending onto the top of the blade C at the rearedge thereof, and to this top part J is secured the arm J 2 byrthe use of the clamping screws J previously mentioned. The scale K is marked on the upper surface of the top part J On loosening the clamping screws J 3 the guide J can be readily adjusted in a lengthwise direction on the blade C so as to cause the pointer L to indicate at the proper mark of the scale ii according to the smallest cutting circle made by the knife or cutter, as before explained;

Having thus described my invention, I a m a n and desire to sew y Letters Patent; i

1. A drafting instrument," comprising a i e hav n a bl de, o r b y marking'tools slidably mounted on the said blade, a guide adjustabll secured to the said blade and provided wit 1 a scale, a pointer on one of the said holders indicating on the said scale, and a connectionbetween the said guide and the said holders to move one at a given ratio relative to the other.

2. A drafting instrumentfc omprising a T-square having a blade, holders carrying marking tools slidably mounted on the said blade, a guide adjustably secured to the said blade and provided with a scale, a pointer on one of the said holders indicating on the said scale, a bell crank lever fulcrumed on one of the said holders and engaging the said guide, and a link connecting the said bell crank lever withthe' other holder. i v

3. A drafting instrument, comprising a T-square having a head and blade, a track for the head of the T -sq'uare to travel on, holders carrying marking tools slidably mounted on the blade of the T-sqiiare, a bell crank lever fulcrumed on one holder, a link pivotally connecting the said bell crank lever with the other holder, and a guide on the said blade and engaged by the said bell crank lever. 'i

4:. A drafting instrument, comprising a fixed track, a T-square having a blade and a head slidable on the said track, holders carryingmarkingtools mounted to slide on the said blade, a guide adjustably secured to the said blade and provided With an arm having a curved slot, a bell crank'lever n11- crumed on one of the said holders" and engaging the said slot, and a link connecting the said bell crank lever with the other holder. v 'i 5. A drafting instrument, comprising a fixed track, a T-square having a blade and a head slidable onthe said track, holders carrying marking tools mounted to slide on the said blade, a guide having a scale, said guide being adjustably secured to the said blade and provided with' arm having a 1,142,585 v V i I 8 curved slot, a bell crank lever i ulcrumed on In testimony whereof I have signed my i one of the said holders and engaging the name to thisspecification in the presence of said slot, a link connecting the said bell two subscribing witnesses.

crank lever to the other holder, and a pointer FREDERICK WALTER LANE. 5 indicating on the said scale and forming part Witnesses:

of the holder on which the said bell crank CHESTER H. RoAKE,

lever is fulcrumed. F. W. JAMISON.

I Gopies of this patent may be obtained for five cents each, by addressing the commissioner ot Patents,

Washington. D. G." I I 

